Java: Switch statement - what is it?
A Switch statement in Java corresponds to an if-else branch with a different Syntax:
- An if statements checks to Boolean values, i.e. "true" or "false". These arise from comparisons, the query in the body of an If-condition. In the gallery you can see examples of the respective cases, view.
- These comparisons assume the Switch statement for you. However, you can only compare data of type "byte", "short", "int", "char", "String" or "enum". In earlier versions of Java (1.6 and below) work only Integer values.
- Conclusion: With if-else branches are more complex queries are possible, with a few more characters to type. A Switch is an elegant variant, to compare variables of certain data types in an efficient and compact.
Switch Statement in Java programming
- A Switch statement starts with the keyword "switch".
- In the parentheses after that - so the Argument follows, the Variable that you want to compare with the cases (Cases). All Cases are enclosed curly brackets.
- After a "case" is always a double point. Behind it you can place the statements you want to execute if the comparison is true.
- Caution: do not Forget you according to your instructions, the "break". Would otherwise result in all following cases are executed until a "break" comes. This is beginners a popular source of errors in programming.
- As a last case you can select a "default case" to implement (see image gallery). Is called, if no other comparison has been applied. Absolutely necessary however, this is not.
Lust on the program found? We will also show you how you Eclipse classes in Java create.
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The queries is the implementation of comparisons with a simple if -. The last else-branch is reached when the comparisons hit previously failed (see default case in Switch). However, this is not the case here, since the last comparison is true and the output is thus "a is 5!" is.
The queries is the implementation of comparisons with a simple if -. The last else-branch is reached when the comparisons hit previously failed (see default case in Switch). However, this is not the case here, since the last comparison is true and the output is thus "a is 5!" is.
Here you can see the equivalent Switch-Statement to image number one. Here is the output of "x is 5!". It would be in none of the cases of "5" would be called the "default case". The output would be then "x does not match any of the values".
Here you can see the equivalent Switch-Statement to image number one. Here is the output of "x is 5!". It would be in none of the cases of "5" would be called the "default case". The output would be then "x does not match any of the values".
Not only with Integer values, a comparison is possible. Here you can see a Switch statement compares the Strings.
Not only with Integer values, a comparison is possible. Here you can see a Switch statement compares the Strings.
